<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const obj = {
            uname: 'pink',
            age: 18,
            hobby: ['乒乓球', '足球'],
            family: {
                baby: '小pink'
            }
        }
        const o = JSON.parse(JSON.stringify(obj))
        console.log(o);
        obj.hobby = ['羽毛球']
        console.log(o);
        console.log(obj);
    </script>
</body>

</html>